That 402 had a real identity crisis. I think the marketing folks knew that the 402 was considered a dog so they didn't want to tell anyone about it. Weird stuff.
The only one considering it a dog is you.
In 1970, the top 402 had solid lifters and 375 horses. This engine, known as the L78, is pretty famous.
The 402/330 that was introduced for regular Chevelles and the Monte Carlo is known as the LS3. It continued on for a few more years. being rated at 300 horses in 1971 and I can't remember what in 1972. How does that compare with dog 383s and 400s from 1971 and beyond?
Like I suggested, it's just your perception.